ts-data-forge/dist/functional/result/impl/result-unwrap-err.d.mts

[](https://www.npmjs.com/package/ts-data-forge) [](https://www.npmjs.com/package/ts-data-forge) [![License](https://img.shields.

import { type UnwrapErr } from './types.mjs';
/**
 * Unwraps a `Result`, returning the error value or `undefined` if it is
 * `Result.Ok`.
 *
 * This provides a safe way to extract error values from Results without
 * throwing exceptions. Useful for error handling patterns where you want to
 * check for specific error conditions.
 *
 * @example
 *
 * ```ts
 * const okResult = Result.ok('data');
 *
 * const errResult = Result.err('problem');
 *
 * // Result.unwrapErr returns undefined for Ok results
 *
 * // eslint-disable-next-line @typescript-eslint/no-confusing-void-expression
 * assert.isTrue(Result.unwrapErr(okResult) === undefined);
 *
 * // Result.unwrapErr returns the error value for Err results
 *
 * assert.isTrue(Result.unwrapErr(errResult) === 'problem');
 * ```
 *
 * @template R The `UnknownResult` type to unwrap.
 * @param result The `Result` to unwrap.
 * @returns The error value if `Result.Err`, otherwise `undefined`.
 */
export declare const unwrapErr: <R extends UnknownResult>(result: R) => UnwrapErr<R> | undefined;
//# sourceMappingURL=result-unwrap-err.d.mts.map